The Nikon P-223 series riflescopes are designed to be rugged and reliable. Specifically built for the AR15 rifle platform and ballistics' matched for the .223 Remington/5.56mm NATO caliber, Nikon has provide you with a specific option to match your needs. The P-223 scope is Waterproof and Fogproof, and is fully multi-coated to provide 98% of light transmission. The spring-loaded instant zero reset turrets provide positive clicks and retention.